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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Revision 1.0 (05-28-09) 42 SMSC LAN8720/LAN8720i
DATASHEET
1.4 Remote Fault 1 = remote fault condition detected
0 = no remote fault
RO/
LH
0
1.3 Auto-Negotiate
Ability
1 = able to perform auto-negotiation function
0 = unable to perform auto-negotiation function
RO 1
1.2 Link Status 1 = link is up,
0 = link is down
RO/
LL
X
1.1 Jabber Detect 1 = jabber condition detected
0 = no jabber condition detected
RO/
LH
X
1.0 Extended
Capabilities
1 = supports extended capabilities registers
0 = does not support extended capabilities registers
RO 1
Table 5.23 Register 2 - PHY Identifier 1
ADDRESS NAME DESCRIPTION MODE DEFAULT
2.15:0 PHY ID Number Assigned to the 3rd through 18th bits of the
Organizationally Unique Identifier (OUI), respectively.
OUI=00800Fh
RW 0007h
Table 5.24 Register 3 - PHY Identifier 2
ADDRESS NAME DESCRIPTION MODE DEFAULT
3.15:10 PHY ID Number Assigned to the 19
th
through 24
th
bits of the OUI. RW 30h
3.9:4 Model Number Six-bit manufacturer’s model number. RW 0Fh
3.3:0 Revision Number Four-bit manufacturer’s revision number. RW DEVICE
REV
Table 5.25 Register 4 - Auto Negotiation Advertisement
ADDRESS NAME DESCRIPTION MODE DEFAULT
4.15 Next Page 1 = next page capable,
0 = no next page ability
This Phy does not support next page ability.
RO 0
4.14 Reserved RO 0
4.13 Remote Fault 1 = remote fault detected,
0 = no remote fault
RW 0
4.12 Reserved
4.11:10 Pause Operation 00 = No PAUSE
01= Symmetric PAUSE
10= Asymmetric PAUSE toward link partner
11 = Both Symmetric PAUSE and Asymmetric
PAUSE toward local device
R/W 00
Table 5.22 Register 1 - Basic Status (continued)
ADDRESS NAME DESCRIPTION MODE DEFAULT